Other than "US" or "USID" of the US Indian Wars what are 2 other edged metal tool proof marks to denote any outdoors historical discovery?
I found a Buck Model #450 using a metal detector and value it only for
cut need as found. I recycle metal found to be of non-historical nature.
An exception was one yard of telegraph wire that was strung to connect Russia with the USA. You can still go find the remainder.